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Accounting for Suspended Exploratory Wells	9 Months Ended
Accounting for Suspended Exploratory Wells	Sep. 30, 2014
Accounting for Suspended Exploratory Wells [Abstract]
Accounting for Suspended Exploratory Wells	Accounting for Suspended Exploratory Wells The capitalized cost of suspended wells at September 30, 2014, was $4.1 billion, a net increase of $834 million from year-end 2013, primarily due to drilling activities. During the nine months ended September 30, 2014, $30 million of exploratory well costs previously capitalized for greater than one year at December 31, 2013, were charged to dry hole expense.